diff --git a/sonoff/user_config.h b/sonoff/user_config.h
index 7503a2338..38a705be7 100644
--- a/sonoff/user_config.h
+++ b/sonoff/user_config.h
@@ -269,7 +269,7 @@
   #define USE_BH1750                             // Add I2C code for BH1750 sensor (+0k5 code)
 //  #define USE_VEML6070                           // Add I2C code for VEML6070 sensor (+0k5 code)
 //  #define USE_TSL2561                            // Add I2C code for TSL2561 sensor using library Joba_Tsl2561 (+2k3 code)
-  #define USE_SI1145                             // Add I2C code for SI1145/46/47 sensor (+1k code)
+//  #define USE_SI1145                             // Add I2C code for SI1145/46/47 sensor (+1k code)
 //  #define USE_ADS1115                            // Add I2C code for ADS1115 16 bit A/D converter based on Adafruit ADS1x15 library (no library needed) (+0k7 code)
 //  #define USE_ADS1115_I2CDEV                     // Add I2C code for ADS1115 16 bit A/D converter using library i2cdevlib-Core and i2cdevlib-ADS1115 (+2k code)
 //  #define USE_INA219                             // Add I2C code for INA219 Low voltage and current sensor (+1k code)
@@ -284,12 +284,12 @@
 #endif  // USE_SPI
 
 // -- Serial sensors ------------------------------
-#define USE_MHZ19                                // Add support for MH-Z19 CO2 sensor (+2k code)
-#define USE_SENSEAIR                             // Add support for SenseAir K30, K70 and S8 CO2 sensor (+2k3 code)
+//#define USE_MHZ19                                // Add support for MH-Z19 CO2 sensor (+2k code)
+//#define USE_SENSEAIR                             // Add support for SenseAir K30, K70 and S8 CO2 sensor (+2k3 code)
   #define CO2_LOW              800               // Below this CO2 value show green light (needs PWM or WS2812 RG(B) led and enable with SetOption18 1)
   #define CO2_HIGH             1200              // Above this CO2 value show red light (needs PWM or WS2812 RG(B) led and enable with SetOption18 1)
-#define USE_PMS5003                              // Add support for PMS5003 and PMS7003 particle concentration sensor (+1k3 code)
-#define USE_NOVA_SDS                             // Add support for SDS011 and SDS021 particle concentration sensor (+0k7 code)
+//#define USE_PMS5003                              // Add support for PMS5003 and PMS7003 particle concentration sensor (+1k3 code)
+//#define USE_NOVA_SDS                             // Add support for SDS011 and SDS021 particle concentration sensor (+0k7 code)
 //#define USE_PZEM004T                             // Add support for PZEM004T Energy monitor (+2k code)
 #define USE_SERIAL_BRIDGE                        // Add support for software Serial Bridge (+0k8 code)
 //#define USE_SDM120                               // Add support for Eastron SDM120-Modbus energy meter (+1k2 code)
@@ -303,9 +303,9 @@
   #define USE_WS2812_CTYPE     NEO_GRB           // WS2812 Color type (NEO_RGB, NEO_GRB, NEO_BRG, NEO_RBG, NEO_RGBW, NEO_GRBW)
 //  #define USE_WS2812_DMA                         // DMA supports only GPIO03 (= Serial RXD) (+1k mem). When USE_WS2812_DMA is enabled expect Exceptions on Pow
 
-#define USE_ARILUX_RF                            // Add support for Arilux RF remote controller (+0k8 code, 252 iram (non 2.3.0))
+//#define USE_ARILUX_RF                            // Add support for Arilux RF remote controller (+0k8 code, 252 iram (non 2.3.0))
 
-#define USE_SR04                                 // Add support for HC-SR04 ultrasonic devices (+1k code)
+//#define USE_SR04                                 // Add support for HC-SR04 ultrasonic devices (+1k code)
 
 //#define USE_DISPLAY                            // Add I2C Display Support for LCD, Oled and up to eigth Matrices (+19k code)